EP 0172568 B1 19901205 - METHOD OF AND DEVICE FOR REALTIME MEASUREMENT OF THE STATE OF POLARIZATION OF A QUASI-MONOCHROMATIC LIGHT BEAM
Title (en)
METHOD OF AND DEVICE FOR REALTIME MEASUREMENT OF THE STATE OF POLARIZATION OF A QUASI-MONOCHROMATIC LIGHT BEAM
Publication
Application
Priority
IT 6783884 A 19840822
Abstract (en)
[origin: EP0172568A2] The method and the device are based on interference techniques. Two quasi-monochromatic radiations (2a, 2b; 102a, 102b; 202a, 202b) with slightly different optical frequencies are generated. A radiation is converted into a 45 DEG linearly-polarized radiation, while the other presents the polarization state imposed by a body under test (4, 204). In each radiation, horizontal and vertical polarization components are separated, and then recombined into two different beams (20a, 21a; 34, 35) comprising radiations at both frequencies, respectively polarized in the same plane. Beatings between the two components of each beam are originated and from the two electrical signals in the radio frequency range thus obtained the information is extracted on the relative phase and the amplitude of the two components of the radiation with polarization imposed by the body under test (4, 204).
IPC 1-7
IPC 8 full level
G01J 4/00 (2006.01); G01J 9/04 (2006.01); G01N 21/21 (2006.01); G01J 4/04 (2006.01)
CPC (source: EP US)
Designated contracting state (EPC)
DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0172568 A2 19860226; EP 0172568 A3 19870902; EP 0172568 B1 19901205; CA 1240174 A 19880809; DE 172568 T1 19871217; DE 3580807 D1 19910117; IT 1179066 B 19870916; IT 8467838 A0 19840822; IT 8467838 A1 19860222; JP H0781915 B2 19950906; JP S6159224 A 19860326; US 4671657 A 19870609
DOCDB simple family (application)
EP 85110477 A 19850821; CA 485943 A 19850628; DE 3580807 T 19850821; DE 85110477 T 19850821; IT 6783884 A 19840822; JP 18196285 A 19850821; US 76716485 A 19850819